import 'react-app-polyfill/ie11';
import 'react-app-polyfill/stable';
import React from 'react';
import ReactDOM from 'react-dom';
import './index.css';

function Square(props) {
  return (
    <button className="square" onClick={props.onClick}>
      {props.value}
    </button>
  );
}
  
class Board extends React.Component {
  
  renderSquare(i) {
    return (
      <Square
        value={this.props.squares[i]}
        onClick={() => this.props.onClick(i)}
      />
    );
  }
  
  render() {
    return (
      <div className="board">
        <div className="board-row">
          {this.renderSquare(0)}
          {this.renderSquare(1)}
          {this.renderSquare(2)}
        </div>
        <div className="board-row">
          {this.renderSquare(3)}
          {this.renderSquare(4)}
          {this.renderSquare(5)}
        </div>
        <div className="board-row">
          {this.renderSquare(6)}
          {this.renderSquare(7)}
          {this.renderSquare(8)}
        </div>
      </div>
    );
  }
}

class Game extends React.Component {

  constructor(props) {
    super(props);
    this.state = {
      history: [],
      current: Array(9).fill(null),
      xIsNext: true,
      winner: '',
    }
  }

  handleClick(i) {
    if(!this.state.current[i]&&!this.state.winner)
    {
      let newSquares=this.state.current.slice();
      newSquares[i] = this.state.xIsNext ? 'X' : 'O';
      let xIsNext = !this.state.xIsNext;
      let winner = calculateWinner(newSquares);
      this.setState({
        history: this.state.history.concat([this.state.current]),
        current: newSquares,
        xIsNext: xIsNext,
        winner: winner
      });
    }
  }

  render() {
    let status=null;
    if (this.state.winner) {
      status = 'Winner: ' + this.state.winner;
    } else {
      status = 'Next player: ' + (this.state.xIsNext ? 'X' : 'O');
    }

    // const moves = [];
    // for(var i=0;i<this.state.history.length;i++)
    // {
    //    moves[i]= (
    //     <li><Board squares={this.state.history[i]} onClick={()=>{}}/></li>
    //   );
    // };

    const moves = this.state.history.map((value,index)=>{
      return <Board squares={value} onClick={()=>{}}/>
    });

    return (
      <div className="game">
        <div className="game-board">
          <Board squares={this.state.current} onClick={ i=> this.handleClick(i)}/>
        </div>
        <div className="game-info">
          <div>{status}</div>
          <div>{moves}</div>
        </div>
      </div>
    );
  }
}

// ========================================

ReactDOM.render(
  <Game />,
  document.getElementById('root')
);

function calculateWinner(squares) {
  const lines = [
    [0, 1, 2],
    [3, 4, 5],
    [6, 7, 8],
    [0, 3, 6],
    [1, 4, 7],
    [2, 5, 8],
    [0, 4, 8],
    [2, 4, 6],
  ];
  for (let i = 0; i < lines.length; i++) {
    const [a, b, c] = lines[i];
    if (squares[a] && squares[a] === squares[b] && squares[a] === squares[c]) {
      return squares[a];
    }
  }
  return null;
}